Combining Philosophers

Ideas for Brad W. Hooker, Robert S. Wolf and Michael Jubien

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3 ideas

4. Formal Logic / F. Set Theory ST / 1. Set Theory

9967	'Impure' sets have a concrete member, while 'pure' (abstract) sets do not [Jubien]

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / e. Axiom of the Empty Set IV

13529

Empty Set: ∃x∀y ¬(y∈x). The unique empty set exists [Wolf,RS]

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / n. Axiom of Comprehension

13526

Comprehension Axiom: if a collection is clearly specified, it is a set [Wolf,RS]